forces

[rigadin]

I would want if you guys can tell me whyand how do forces occur??

Thanks:doh:

[tvp45]

Forces are, after all's said and done, only a description of what actually happens. You can do all of Physics without the concept of force; it's just easier to use that idea at first. My advice - just accept them and use them.

[Klaynos]

By forces do you mean something like a ball being pushed, or the 4 fundemental forces?

 

 

And tvp45 for ALOT (if not nearly all) mechanics problems not using forces normally works out easier (reduces the complexity of the differential equations that need to be solved)...

[Meir Achuz]

I would want if you guys can tell me whyand how do forces occur??

Thanks:doh:

Forces are useful concepts in statics problems and were historically important in Newtonian mechanics, but using force in relativistic or quantum mechnics is confusing, and generally avoided. The concept of force is ambiguous in relativity and QM, often being used incorrectly if tried.

[rigadin]

Forces are, after all's said and done, only a description of what actually happens. You can do all of Physics without the concept of force; it's just easier to use that idea at first. My advice - just accept them and use them.

 

But my teacher asked me to find out

[Severian]

Tell your teacher that forces are a consequence of insisting that the universe be symmetric under the local transformations of particular Lie groups. Ask your teacher to explain that statement in detail.

[ajb]

Nice way of putting it Severian! If he is looking at the "fundamental forces".

 

I expect that rigadin teacher is after an explanation of forces in the "Newtonian" sense. So, rate of "change of momentum".

 

Or maybe he is looking for "generalised forces" in the Lagrangian formalism. But then what school teacher knows about that?

[thedarkshade]

I would want if you guys can tell me whyand how do forces occur??

Thanks:doh:

My definition of force is "a change in inertial state"! Because bodies are in inertial state when nothing acts on them, so a change on that state is actually a force!

 

And yet an easier definition of force (on a book I've read) is "force is a push or a pull"! And they're physicists who wrote that!

[Klaynos]

When I was young... (around 10) I was taught by a "physics teacher" that a force is a pull, push or a twist (which can be considered a combination of the former 2).... Now I'm not young I know differently

[swansont]

My definition of force is "a change in inertial state"! Because bodies are in inertial state when nothing acts on them, so a change on that state is actually a force!

 

But which is the cause and which the effect?

[frost]

But which is the cause and which the effect?

The cause is the force acting on the body and the effect is the change of inertial state!

[Riogho]

What is the force that causes subatomic particles to be in constant motion, you know the fact that atoms are always moving, and stuff

[insane_alien]

What is the force that causes subatomic particles to be in constant motion, you know the fact that atoms are always moving, and stuff

 

theres no force causing that. you might want to look up 'momentum' and newtons laws of motion.

[brainfart94]

The cause is the force acting on the body and the effect is the change of inertial state!

 

What rigadin is trying to ask is what causes the force, rather than what it does, and since every force is a result of another force in some way, you could follow a whole chain of different forces that would eventually lead you back to the first force in the universe: the Big Bang. But then that raises your question even further; how the heck did that force occur?

[Encrypted]

God?

 

 

*Runs away and prepares a bunker against anti-religious misiles"*

[ydoaPs]

Forces are, after all's said and done, only a description of what actually happens.

Isn't all of science just a description of what actually happens?

[thedarkshade]

Isn't all of science just a description of what actually happens?

It's a bit more I think! It's knowing why they happen and making them happen!

[MrMongoose]

Why they happen is theology and making them happen is engineering. Whether engineering is science is doubtful (say's an ashamed engineer).

[thedarkshade]

Why they happen is theology and making them happen is engineering. Whether engineering is science is doubtful (say's an ashamed engineer).

But ain't engineering a product of science?

[MrMongoose]

The way I do it is, but it seems im surrounded by people who prefer to bodge stuff and fix it later. I think they all wanted to be car mechanics but with a bigger paycheck, then started crying when they realised they'd have to do some maths.

 

Nothing wrong with mechanics but I'm sure if they'd designed my pedestal it'd be too weak or overpriced.

[thedarkshade]

... but it seems im surrounded by people who prefer to bodge stuff and fix it later.

Looks like everywhere is the same situation:doh: .